code: def __getitem__(self, idx):
      return self._get_mustc_item(idx)
  
file_path: audio/examples/asr/emformer_rnnt/mustc/dataset.py
imports: from pathlib import Path
  from typing import Union
  import torch
  import torchaudio
  import yaml
label_desc: Use image node_id 3 for calling the MUSTC obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self